US20050268312A1 - Disk-loading device - Google Patents

Disk-loading device Download PDF

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Publication number
US20050268312A1
US20050268312A1 US10/521,154 US52115405A US2005268312A1 US 20050268312 A1 US20050268312 A1 US 20050268312A1 US 52115405 A US52115405 A US 52115405A US 2005268312 A1 US2005268312 A1 US 2005268312A1
Authority
US
United States
Prior art keywords
tray
loading
guide groove
unloading
disc
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US10/521,154
Other languages
English (en)
Inventor
Akihiro Fukasawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Assigned to MITSUBISHI DENKI KABUSHIKI KAISHA reassignment MITSUBISHI DENKI KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FUKASAWA, AKIHIRO
Publication of US20050268312A1 publication Critical patent/US20050268312A1/en
Abandoned legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B17/00—Guiding record carriers not specifically of filamentary or web form, or of supports therefor
    • G11B17/02—Details
    • G11B17/04—Feeding or guiding single record carrier to or from transducer unit
    • G11B17/041—Feeding or guiding single record carrier to or from transducer unit specially adapted for discs contained within cartridges
    • G11B17/043—Direct insertion, i.e. without external loading means
    • G11B17/0432—Direct insertion, i.e. without external loading means adapted for discs of different sizes
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B17/00—Guiding record carriers not specifically of filamentary or web form, or of supports therefor
    • G11B17/02—Details
    • G11B17/04—Feeding or guiding single record carrier to or from transducer unit
    • G11B17/05—Feeding or guiding single record carrier to or from transducer unit specially adapted for discs not contained within cartridges
    • G11B17/053—Indirect insertion, i.e. with external loading means
    • G11B17/056—Indirect insertion, i.e. with external loading means with sliding loading means
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
    • G11B33/02—Cabinets; Cases; Stands; Disposition of apparatus therein or thereon
    • G11B33/08—Insulation or absorption of undesired vibrations or sounds

Definitions

  • the present invention relates to a disc loading device suitably used in a compact disc player.
  • FIG. 7 is an exploded view of a disc loading device
  • FIG. 8 is a perspective view showing a tray in an unloaded state
  • FIG. 9 is a perspective view showing the tray in a loaded state.
  • a rotating gear 13 is disposed in a main chassis 11 , and torque is transmitted to the rotating gear 13 from a loading motor (not shown).
  • the rotating gear 13 meshes with a rack 12 b disposed at a tray 12 , and the rotational motion of the rotating gear 13 is converted to rectilinear motion, whereby the tray is loaded in the main chassis and unloaded from the main chassis.
  • the displacement amount of the oscillation is a maximum at the unloading-direction distal end portion of the tray 12 , and is regulated by the size of a gap between a guide groove 12 a disposed in both end portions of the tray and guides 11 a, 11 b and 11 c disposed at the main chassis. This gap is disposed in order to avoid a state where the guide groove 12 a pressingly fits into and slides in the guides 11 a, 11 b and 11 c.
  • the displacement at this distal end portion is dependent on things other than the guide groove 12 a and the guides 11 a, 11 b and 11 c; specifically, it is dependent on the distance between the first guide 11 a and the second guide 11 b disposed at the main chassis 11 , and also on the depth dimension of the tray 12 or the guide groove 12 a.
  • the degree of freedom of the substantial design is extremely small because a stroke equal to or greater than the diameter of the disc is required.
  • the displacement of the unloading-direction distal end portion of the tray 12 at the time of the oscillation may be said to be controlled by the width of the guide groove 12 a and the gap with the first guide 11 a and the second guide 11 b.
  • the linearity in the loading/unloading direction of the guide groove 12 a is 0.2 mm, it is necessary to make the gap between the guide groove 12 a and each guide 11 a, 11 b and 11 c on the main chassis 11 be about 0.25 mm to about 0.35 mm in order to avoid the state where the guide groove 12 a and the guides 11 a, 11 b and 11 c pressingly fit together and slide at the time of loading/unloading.
  • the displacement amount at the unloading-direction distal end portion of the tray 12 at the time of the oscillation becomes about five times the gap between the guide groove 12 a and each guide 11 a, 11 b and 11 c.
  • the displacement amount becomes about 1.25 mm
  • the displacement amount becomes about 2.00 mm.
  • the vibratory oscillation immediately after the start of the unloading of the tray and immediately before the end of the unloading of the tray causes the operating quality to significantly drop, but this does not become a problem in terms of operating quality as long as the displacement of the tray unloading-direction distal end portion can be held to about 1 mm or less.
  • this does not become much of a problem in terms of operating quality as long as the gap between the guide groove 12 a and the guides 11 a, 11 b and 11 c on the main chassis 11 can be managed to 0.2 mm or less.
  • the gap between the guide groove 12 a and the guides 11 a, 11 b and 11 c on the main chassis 11 has not been able to be set to 0.2 mm or less because, as mentioned above, the precision of the linearity of the guide groove 12 a disposed in the tray 12 has been about 0.2 mm.
  • the present invention has been made in order to solve the above-described problem, and it is an object thereof to obtain a disc loading device where, because vibratory oscillation of the tray 12 is suppressed to an extent that it does not become a problem in terms of operating quality, the problems of an extreme drop in speed and inoperability do not occur even if the gap between the guide groove 12 a and the guides 11 a, 11 b and 11 c on the main chassis 11 is configured to be 0.2 mm or less, and to obtain a disc loading device that can suppress vibratory oscillation of the tray 12 without dependency on the gap between the guide groove 12 a and the guides 11 a, 11 b and 11 c on the main chassis 11 .
  • the disc loading device pertaining to this invention comprises: a tray in which a disc is placed; a main chassis into which the tray is loaded and from which the tray is unloaded; a guide groove disposed parallel to a loading/unloading direction in the tray or the main chassis; and guides that are disposed at the main chassis or the tray and engage with the guide groove, wherein the width of the guide groove in the vicinity of a loading start position or an unloading end position of the tray is formed narrower than the width at another portion.
  • the disc loading device pertaining to this invention comprises: a guide groove disposed parallel to a loading/unloading direction in the tray or the main chassis; guides that are disposed at the main chassis or the tray and engage with the guide groove; and an elastic body that presses a side wall of the guide groove and the guides into contact at the time of loading/unloading of the tray.
  • the disc loading device pertaining to this invention comprises: a guide wall disposed in the main chassis or the tray; a lateral pressure wall disposed parallel to a loading/unloading direction in the tray or the main chassis; and an elastic body that presses the guide wall and the lateral pressure wall into contact at the time of loading/unloading of the tray.
  • FIG. 1 is a cross-sectional view in an instance where a guide groove in a tray unloaded state of a disc loading device pertaining to a first embodiment of the invention is seen from below a main chassis.
  • FIG. 2 is an exploded view of a disc loading device of a second embodiment of the invention.
  • FIG. 3 is a perspective view of relevant portions of the disc loading device of the second embodiment of the invention.
  • FIG. 4 is a cross-sectional view in an instance where a guide groove in a tray unloaded state of the disc loading device of the second embodiment of the invention is seen from below the main chassis.
  • FIG. 5 is a cross-sectional view in an instance where a guide groove in a tray unloaded state of a disc loading device of a third embodiment of the invention is seen from below the main chassis.
  • FIG. 6 is a cross-sectional view in an instance where a guide groove in a tray unloaded state of a disc loading device of a fourth embodiment of the invention is seen from below the main chassis.
  • FIG. 7 is an exploded view showing a conventional disc loading device.
  • FIG. 8 is a perspective view of the conventional optical disc device showing a tray in an unloaded state.
  • FIG. 9 is a perspective view of the conventional optical disc device showing the tray in a loaded state.
  • FIG. 1 shows a disc loading device of a first embodiment of the invention, and is a cross-sectional view in an instance where a guide groove 12 a in the vicinity of a loading start position of a tray 12 is seen from below a main chassis 11 .
  • the tray 12 in which a disc is placed and in which the guide groove 12 a parallel to a loading/unloading direction is disposed, is loaded in and unloaded from the main chassis 11 , in which guides 11 a and 11 b that engage with the guide groove are disposed.
  • the guide groove 12 a includes a section A where the width in the vicinity of the loading start position of the tray 12 is narrowly formed.
  • the section A is configured so that a gap between the guide groove 12 a and the guides 11 a, 11 b and 11 c is 0.1 mm to 0.2 mm.
  • the gap between the guide groove 12 a and the guides 11 a, 11 b and 11 c in the section A is determined by the linearity of the guide groove 12 a, and the linearity is proportion to the length of the guide groove.
  • the total length of the guide groove is 200 mm, whereby precision of about 0.05 mm can be easily obtained by making the length of the section A about 45 mm, and the configuration at the gap becomes possible.
  • the width of the guide groove 12 a at the portion other than the section A is formed so that the gap with the guides 11 a, 11 b and 11 c becomes 0.25 mm to 0.35 mm, loading/unloading at a light load is conducted without there arising a reduction in the gap with the guides 11 a, 11 b and 11 c after the guides 11 a, 11 b and 11 c pass through the section A and an increase in load resulting from constriction.
  • the loading of the tray 12 starts as a result of a rotating gear 13 being rotationally driven by a loading motor (not shown) from the state of FIG. 8 , which is a tray unloaded state.
  • a loading motor not shown
  • the torque of the motor is transmitted to a rack 12 b from the rotationally driven rotating gear 13 , and the rotational motion of the rotating gear 13 is converted by the rack 12 b to rectilinear motion.
  • the guide groove 12 a is guided by the guides 11 a, 11 b and 11 c, whereby the tray 12 is loaded in the main chassis 11 and finally reaches the loaded state shown in FIG. 9 .
  • the disc When the tray 12 is loaded in the main chassis 11 , the disc is retained by a damper 18 shown in FIG. 9 and a turntable (not shown), and tray loading ends.
  • the loading of the tray 12 is conducted as described above, but immediately after the start thereof, similar to the conventional disc loading device, vibratory oscillation temporarily arises due to the moment around the center of gravity of the tray resulting from a shift between the position of the center of gravity of the tray and the point where the force with which the rotating gear 13 drives the rack 12 b acts.
  • the displacement of this oscillation becomes a maximum of 1 mm at the unloading-direction distal end position of the tray 12 because the gap between the guide groove 12 a and the guides 11 a, 11 b and 11 c is a maximum of 0.2 mm, so that high quality tray loading is conducted, and the occurrence of abnormal noises can be suppressed.
  • the unloading of the tray 12 also starts as a result of the rotating gear 13 being rotationally driven by the motor (not shown), and the same oscillation seen immediately after loading of the tray 12 also occurs immediately before the end of the unloading of the tray 12 .
  • the displacement at the unloading-direction distal end position of the tray. 12 is a maximum of 1 mm, and high quality unloading of the tray 12 is conducted.
  • the parallel state between the loading/unloading direction and the guide groove is more reliably maintained at the time loading starts and at the time unloading ends, and the higher quality tray unloading can be obtained.
  • FIGS. 2 to 4 are diagrams showing a second embodiment of the invention.
  • FIG. 2 is an exploded view of the disc loading device of the second embodiment of the invention
  • FIG. 3 is a perspective view of relevant portions of the disc loading device of the second embodiment of the invention
  • FIG. 4 is a cross-sectional view in an instance where the guide groove 12 a in the tray unloaded state of the disc loading device of the second embodiment of the invention is seen from below the main chassis 11 .
  • the configuration of the second embodiment is substantially the same as that of the first embodiment, except that in the second embodiment, the gap between the guide groove 12 a and the guides 11 a, 11 b and 11 c is constant (e.g., 0.25 mm to 0.35 mm) across the total length of the guide groove 12 a to the extent that fitting together and sliding can be prevented, and an elastic body 11 d (e.g., a plate spring), which presses at least one side wall of the guide groove 12 a and the guides 11 a, 11 b and 11 c into contact in the X direction shown in the drawings or the direction opposite to this at the time of loading/unloading of the tray 12 , is integrally disposed at the main chassis 11 .
  • an elastic body 11 d e.g., a plate spring
  • the loading/unloading of the tray 12 is conducted in the same manner as in the first embodiment, and the gap between the guide groove 12 a and the guides 11 a, 11 b and 11 c is present (0.25 mm to 0.35 mm) similar to the conventional device, whereby the vibratory oscillation. immediately after the start of the loading and immediately before the end of the unloading of the tray 712 similarly arises. However, because the side wall of the guide groove 12 a is pressed by the elastic body 11 d into contact with the guides 11 a, 11 b and 11 c, the oscillation is suppressed, and similar to the first embodiment, high quality loading/unloading of the tray 12 is conducted.
  • FIG. 5 shows the disc loading device of a third embodiment of the invention, and is a cross-sectional view in an instance where the guide groove 12 a in the tray unloaded state of the disc loaded device is seen from below the main chassis 11 .
  • the third embodiment is one where the second embodiment is developed, and the configuration is substantially the same as that of the second embodiment, except that in the third embodiment, a step 13 is disposed, in the vicinity of the loading start position of the tray 12 , in the side wall of the guide groove 12 a that is acted upon by lateral pressure due to the elastic body 11 d.
  • the loading/unloading of the tray 12 is conducted in the same manner as in the second embodiment, and the vibratory oscillation immediately after the start of loading and immediately before the end of unloading of the tray 12 is similarly generated.
  • the side wall of the guide groove 12 a is pressed into contact with the guides 11 a, 11 b and 11 c by the elastic body 11 d , the oscillation is suppressed, and high quality loading/unloading of the tray 12 is conducted similar to the first embodiment.
  • the step 13 is disposed in the side wall of the guide groove 12 a that is acted upon by lateral pressure due to the elastic body 11 d.
  • the displacement of the elastic body 11 d in the vicinity of the loading start position becomes larger than the displacement at another portion.
  • lateral pressure can effectively act on the side wall of the guide groove 12 a only in the vicinity of the loading start position of the tray 12 .
  • the driving force necessary to load/unload the tray 12 can be reduced in comparison to the second embodiment in terms of the overall operation.
  • the loading/unloading of the tray 12 can be conducted with a light load, and the operating speed of the tray 12 can be lowered enormously. Also, because the friction between the side wall of the guide groove 12 a and the press-contact portion of the elastic body 11 d accompanying repeated loading/unloading of the tray 12 can be reduced, the change in the lateral pressure acting on the tray 12 is slight even after loading/unloading of the tray 12 has been repeated numerous times, and high quality loading/unloading of the tray 12 can be conducted over a long period of time. This effect becomes larger as the displacement of the elastic body 11 d other than in the vicinity of the loading start position of the tray 12 approaches zero.
  • elastic bodies 11 d are disposed between adjacent guides 11 a, 11 b and 11 c, whereby the side wall of the guide groove 12 a pressingly contacts the same-direction side surfaces of adjacent guides 11 a, 11 b and 11 c.
  • the loading/unloading of the tray 12 is conducted in a state where the parallelism between the main chassis 11 and the tray 12 is maintained, so that higher quality loading/unloading is obtained.
  • the elastic body is plurally disposed in the vicinity of the loading start position of the tray 12 , the same effect is obtained even if the guides 11 a, 11 b and 11 c are disposed between adjacent elastic bodies.
  • FIG. 6 is a diagram showing a fourth embodiment of this invention, and is a cross-sectional view in an instance where the guide groove 12 a in the tray unloaded state of the disc loading device is seen from below the main chassis 11 .
  • a lateral pressure wall 12 c is disposed in the tray 12 parallel to the loading/unloading direction, and a guide wall lie is disposed in the main chassis 11 parallel to the lateral pressure wall 12 c.
  • the tray 12 in which a disc is disposed, is loaded in and unloaded from the main chassis 11 by the lateral pressure wall 12 c and the guide wall lie. Additionally, the lateral pressure wall 12 c and the guide wall lie are pressed into contact, at the time of the loading/unloading of the tray 12 , by elastic bodies 11 d disposed in the main chassis 11 .
  • the guide wall 11 e does not have to be continuously disposed parallel to the lateral pressure wall 12 c as shown in FIG. 6 , but may be disposed intermittently in pairs with the elastic bodies 11 d, for example.
  • the loading/unloading of the tray 12 is conducted in the same manner as in the first embodiment.
  • the lateral pressure wall 12 c disposed in the tray 12 is guided by the guide wall lie disposed parallel to the lateral pressure wall 12 c, whereby the tray 12 is loaded in the main chassis 11 and finally reaches the loaded state shown in FIG. 9 .
  • vibratory oscillation immediately after the start of loading or immediately before the end of unloading of the tray 12 occurs in the same manner as the in the first embodiment.
  • the lateral pressure wall 12 c is pressed into contact with the guide wall lie by the elastic bodies 11 d, the oscillation is suppressed, and high quality loading/unloading of the tray 12 is conducted.
  • the guide groove 12 a and the guides 11 a, 11 b and 11 c of the first, second and third embodiments, and the guide wall 11 e and the lateral pressure wall 12 c of the fourth embodiment, may be disposed in either the tray 12 or the main chassis 11 .
  • the elastic body 11 d does not have to be a plate spring; it suffices as long as the elastic body 11 d can give appropriate lateral pressure to the side wall of the guide groove 12 a or the lateral pressure wall 12 c, such as rubber or a coil spring.
  • the elastic body 11 d may be configured separately from the main chassis 11 or the tray 12 as needed, but by forming the elastic body 11 d integrally with the main chassis 11 or the tray 12 as in the second to fourth embodiments, a disc loading device whose operating quality is high can be obtained without adding new parts to a conventional disc loading device.
  • the disc loading device pertaining to this invention can be used not only in compact disc players but in various types of disc loading devices like DVD players.

Landscapes

  • Feeding And Guiding Record Carriers (AREA)
  • Automatic Disk Changers (AREA)
US10/521,154 2002-10-24 2003-08-29 Disk-loading device Abandoned US20050268312A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2002310021A JP3651608B2 (ja) 2002-10-24 2002-10-24 ディスクローディング装置
JP2002-310021 2002-10-24
PCT/JP2003/011013 WO2004038718A1 (ja) 2002-10-24 2003-08-29 ディスクローディング装置

Publications (1)

Publication Number Publication Date
US20050268312A1 true US20050268312A1 (en) 2005-12-01

Family

ID=32171031

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/521,154 Abandoned US20050268312A1 (en) 2002-10-24 2003-08-29 Disk-loading device

Country Status (6)

Country Link
US (1) US20050268312A1 (ja)
EP (1) EP1557831B1 (ja)
JP (1) JP3651608B2 (ja)
CN (1) CN100403428C (ja)
TW (1) TWI291690B (ja)
WO (1) WO2004038718A1 (ja)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040244021A1 (en) * 2003-05-28 2004-12-02 Actima Technology Corporation Anti-vibration tray support structure
US20060026611A1 (en) * 2004-07-28 2006-02-02 Samsung Electronics Co., Ltd. Vibration preventing device and optical disc drive having the same
US20060143624A1 (en) * 2004-12-29 2006-06-29 Hon Hai Precision Industry Co., Ltd. Disc drive apparatus with guiding ribs

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5204850A (en) * 1989-08-31 1993-04-20 Sony Corporation Loading apparatus for a disc-shaped recording medium
US5732064A (en) * 1996-11-20 1998-03-24 Behavior Tech Computer Corporation Optic disk drive vibration absorbing device
US20060026611A1 (en) * 2004-07-28 2006-02-02 Samsung Electronics Co., Ltd. Vibration preventing device and optical disc drive having the same
US20070050788A1 (en) * 2005-08-30 2007-03-01 Samsung Electronics Co., Ltd. Optical disc drive

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08190755A (ja) * 1995-01-05 1996-07-23 Matsushita Electric Ind Co Ltd ディスク再生装置
JPH10214446A (ja) * 1997-01-31 1998-08-11 Samsung Electron Co Ltd ディスク駆動装置
JP3780631B2 (ja) * 1997-06-06 2006-05-31 ソニー株式会社 記録媒体駆動装置
JPH11162071A (ja) * 1997-11-25 1999-06-18 Sony Corp 光ディスク装置
JP3624691B2 (ja) * 1998-05-29 2005-03-02 日本ビクター株式会社 ディスク駆動装置
JP2001216703A (ja) * 2000-01-31 2001-08-10 Sony Corp ディスクドライブ装置
JP2001291302A (ja) * 2000-03-31 2001-10-19 Toyosaku Matsumoto 光ディスク機器などに組み込まれる精度の高いトレイ用スライド機構。
KR20020069547A (ko) * 2001-02-26 2002-09-05 삼성전자 주식회사 트레이 떨림 방지 구조체를 구비한 디스크 드라이브

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5204850A (en) * 1989-08-31 1993-04-20 Sony Corporation Loading apparatus for a disc-shaped recording medium
US5732064A (en) * 1996-11-20 1998-03-24 Behavior Tech Computer Corporation Optic disk drive vibration absorbing device
US20060026611A1 (en) * 2004-07-28 2006-02-02 Samsung Electronics Co., Ltd. Vibration preventing device and optical disc drive having the same
US20070050788A1 (en) * 2005-08-30 2007-03-01 Samsung Electronics Co., Ltd. Optical disc drive

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040244021A1 (en) * 2003-05-28 2004-12-02 Actima Technology Corporation Anti-vibration tray support structure
US20060026611A1 (en) * 2004-07-28 2006-02-02 Samsung Electronics Co., Ltd. Vibration preventing device and optical disc drive having the same
US20060143624A1 (en) * 2004-12-29 2006-06-29 Hon Hai Precision Industry Co., Ltd. Disc drive apparatus with guiding ribs

Also Published As

Publication number Publication date
EP1557831A4 (en) 2006-07-12
CN1669083A (zh) 2005-09-14
JP2004145981A (ja) 2004-05-20
EP1557831A1 (en) 2005-07-27
CN100403428C (zh) 2008-07-16
JP3651608B2 (ja) 2005-05-25
WO2004038718A1 (ja) 2004-05-06
TWI291690B (en) 2007-12-21
EP1557831B1 (en) 2011-12-28
TW200409099A (en) 2004-06-01

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Owner name: MITSUBISHI DENKI KABUSHIKI KAISHA, JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:FUKASAWA, AKIHIRO;REEL/FRAME:016801/0018

Effective date: 20041220

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION